Measurement of the thermal diffusivity of molten salts by the forced Rayleigh scattering method. (Measurement of molten alkali metal chlorides at temperatures above 1000 °C)

Naoki Nakazawa, Masanori Akabori, Yuji Nagasaka, Akira Nagashima

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The paper reports measurements of the thermal diffusivity of four molten alkali chlorides (LiCl, NaCl, RbCl and CsCl) in the temperature range above 1000°C by the forced Rayleigh scattering method. The dye substance employed is K2Cr2O7 in order to color the transparent molten salts. The accuracy is estimated to be ±4 to ±11% depending on the measured substances. In comparison with the present results converted to thermal conductivity, most of the previous experimental data obtained by steady-state methods show larger values (up to about five times) which may be due to the presence of convection and radiation. It is found that the thermal conductivity of these series of molten alkali metal chlorides decreases with increasing molecular weight, and the temperature coefficients are weakly negative.

Original languageEnglish
Pages (from-to)1467-1473
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume56
Issue number525
Publication statusPublished - 1990 May
Externally publishedYes

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Rayleigh scattering
Thermal diffusivity
molten salts
Alkali metals
thermal diffusivity
alkali metals
Molten materials
thermal conductivity
chlorides
Salts
Thermal conductivity
molecular weight
alkalies
convection
dyes
color
Temperature
temperature
radiation
coefficients

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "The paper reports measurements of the thermal diffusivity of four molten alkali chlorides (LiCl, NaCl, RbCl and CsCl) in the temperature range above 1000°C by the forced Rayleigh scattering method. The dye substance employed is K2Cr2O7 in order to color the transparent molten salts. The accuracy is estimated to be ±4 to ±11{\%} depending on the measured substances. In comparison with the present results converted to thermal conductivity, most of the previous experimental data obtained by steady-state methods show larger values (up to about five times) which may be due to the presence of convection and radiation. It is found that the thermal conductivity of these series of molten alkali metal chlorides decreases with increasing molecular weight, and the temperature coefficients are weakly negative.",
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T1 - Measurement of the thermal diffusivity of molten salts by the forced Rayleigh scattering method. (Measurement of molten alkali metal chlorides at temperatures above 1000 °C)

AU - Nakazawa, Naoki

AU - Akabori, Masanori

AU - Nagasaka, Yuji

AU - Nagashima, Akira

PY - 1990/5

Y1 - 1990/5

N2 - The paper reports measurements of the thermal diffusivity of four molten alkali chlorides (LiCl, NaCl, RbCl and CsCl) in the temperature range above 1000°C by the forced Rayleigh scattering method. The dye substance employed is K2Cr2O7 in order to color the transparent molten salts. The accuracy is estimated to be ±4 to ±11% depending on the measured substances. In comparison with the present results converted to thermal conductivity, most of the previous experimental data obtained by steady-state methods show larger values (up to about five times) which may be due to the presence of convection and radiation. It is found that the thermal conductivity of these series of molten alkali metal chlorides decreases with increasing molecular weight, and the temperature coefficients are weakly negative.

AB - The paper reports measurements of the thermal diffusivity of four molten alkali chlorides (LiCl, NaCl, RbCl and CsCl) in the temperature range above 1000°C by the forced Rayleigh scattering method. The dye substance employed is K2Cr2O7 in order to color the transparent molten salts. The accuracy is estimated to be ±4 to ±11% depending on the measured substances. In comparison with the present results converted to thermal conductivity, most of the previous experimental data obtained by steady-state methods show larger values (up to about five times) which may be due to the presence of convection and radiation. It is found that the thermal conductivity of these series of molten alkali metal chlorides decreases with increasing molecular weight, and the temperature coefficients are weakly negative.

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